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Finding the Fourth Proportional to 1,602.40, 2,211.28 and 939.28

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Solution

The fourth proportional to 1,602.40, 2,211.28 and 939.28 is: 1,296.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,602.40 : 2,211.28 = 939.28 : x
  2. Step 2: Convert to fraction form
    1,602.40/2,211.28 = 939.28/x
  3. Step 3: Cross multiply
    1,602.40x = 2,211.28 × 939.28
  4. Step 4: Simplify right side
    1,602.40x = 2,077,011.08
  5. Step 5: Solve for x
    x = 2,077,011.08/1,602.40
  6. Step 6: Final answer
    x = 1,296.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.